Layers of activated carbon with grafted sodium and potassium glycinate derivatives on the surface of PVC film |
| Author : Maxim P. Shabanov, Aslan Yu Tsivadze, Alexander Ya Fridman, Elena M. Morozova, Alexander M. Gorbunov, Alexey A. Averin |
| Abstract | Full Text |
Abstract :Porous layers from active carbon with macro-molecular cyclic amines with sodium or potassium acetate substituents were synthesized. Layers sewn to the surface of a film of PVC. It is
shown that the graft zones around carbon particles consist of luminophore groupings in the form of conjugated rings, including radicals with substituted amino groups, conjugated carbon groups and oxygen atoms binding these groups. The electronic conductivity of the layers and their sorption capacity
for the absorption of benzene vapor are measured. It is established that the conductivity of the layer is the higher, the smaller the PVC derivatives, the carbon particles are combined. The conductivity of the layers with potassium ions is greater than that of sodium ions. It is assumed that most of the vapors are concentrated in the pores in the carbon. The sorption capacity of layers with sodium ions is greater than that of potassium ions. |
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Augmentation in thermal efficiency of three sides over one side concave dimple roughened ducts |
| Author : Vikash Kumar and Laljee Prasad |
| Abstract | Full Text |
Abstract :We present experimental investigations and comparison on thermal efficiency of solar thermal air heater (SAH) with 1-side and 3-side concave dimple roughened ducts; under the Reynold’s number (Re) range of 2500 - 12500; relative roughness pitch (p/e) of 8 – 15; and relative roughness height (e/Dh) of 18 - 0.045. Maximum thermal efficiency was observed at p/e = 12 and e/Dh = 0.036. The increase in thermal efficiency of 3-sides over that of 1-side roughened duct is found to be about 44 - 56 % for varying p/e and 39-51 % for varying e/Dh. Present results and understanding is useful in practically designing an efficient solar thermal air heater. |
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